Pmxbot

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* Issue 38: Google Search now works again, but requires
an API key. Request an API key for your deployment
and set the 'Google API key' config variable to that
value to restore the !g command.
* Moved most of the logging logic into the ``logging``
module, making it an optional module that could be
extracted to a separate package except for dependencies
in the viewer and saysomething modules.
* Added a new ``core.ContentHandler`` message
handler, suitable for handling any messages that passes
through the bot.

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* ``rand_bot`` commands can now be configured in the
``random commands`` config variable. Because it now
resolves commands by name, it's possible for rand_bot
to now respond with commands from other plugins.

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* Dropped support for Python 3.2.

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* Moved paste command to librarypaste package.
Require it in your deployment to retain the paste command.
* Removed support for 'silent_bot' config variable. Instead,
to override the default command bot, pass the path to the
class as ``"bot class": "pmxbot.irc:SilentCommandBot"``.
* Removed implicit construction of ``pmxbot.config``. Instead,
that ConfigDict is constructed explicitly during initialization
of the bot or the viewer.

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* Add missing import

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* Fix `saysomething` command